igneous
Likely amazonite-bearing pegmatite
Granite pegmatite containing amazonite (microcline feldspar, KAlSi₃O₈); exact identification is uncertain from the photo
AI-generated identification · may be incorrectRough, irregular specimen with pale cream feldspar and blue-green patches. Amazonite has Mohs hardness 6–6.5, vitreous to pearly luster, and two good cleavage directions; associated light minerals may include quartz and other feldspar.
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Physical properties
Rough, irregular specimen with pale cream feldspar and blue-green patches. Amazonite has Mohs hardness 6–6.5, vitreous to pearly luster, and two good cleavage directions; associated light minerals may include quartz and other feldspar.
Formation & geological history
Pegmatite forms as coarse crystals from late-stage, silica-rich magma; such bodies are commonly Precambrian, though this specimen’s age and source cannot be determined visually.
Uses & applications
Amazonite is used for beads, carvings, and ornamental stone; pegmatite minerals are also collected and can be sources of industrial minerals.
Geological facts
Amazonite is the green-blue variety of microcline, not a separate mineral species. Its color is associated with trace lead and water-related defects in the crystal structure.
Field identification & locations
The blue-green feldspar patches suggest amazonite, but a photo cannot confirm the mineral or the cream-colored matrix. Look for feldspar cleavage and a pale streak; common sources include Colorado, Madagascar, Brazil, and Russia.
